SCIENTIFIC PROCEEDINGS. 



VOLUME XIII. 



1. A Seed-Bearing Irish Pteridosperm, Grossotheca Honinghaiisi, Kidstoa 



[Lyginodendron oldhammm, Williamson). By T. Johnson, d.so., f.l.s. 

 Plates I.-III.) (March, 1911.) Is. 



2. Considerations and Experiments on the supposed Infection of the Potato Crop 



with the Blight Faugas {Phytophthora infestans) by means of Mycelium 

 derived directly from the planted Tubers. By George H. Pethybridge, 

 B.so., PH.D. (March, 1911.) Is. 

 S. Mechanical Stress and Magnetisation of Nickel (Part II.), and the Subsidence 

 of Torsional Oscillations in Nickel and Iron Wires when subjected to the 

 Influence of Longitudinal Magnetic Fields. By William Brown, b.so. 

 (April 15, 1911). Is* 



4. A Thermo-Eleetric Method of Cryoscopy. By Henr? H. Dixon, so.d., f.b.s. 



(April 20, 1911). Is. 



5. A Method of Exact Determination of the Continuous Change in Absolute 



Density of a Substance, e.g. Wax, in passing through its Fusion Stage. 

 By William J. Lyons, b.a., a.r.c.so. (lond.). (May 16, 1911). Gd. 



6. Radiant Matter. By John Joly, sc.d., p.r.s. (June 9, 1911.) Is. 



7. The Inheritance of Milk-Yield in Cattle. By James Wilson, m.a., b.so. 



(June 12, 1911.) Is. 



8. Is Archseopteris a Pteridosperm ? By T. Johnson, d.sc, f.l.s. (Plates 



IV.-VL) (June 28, 1911.) Is. 6d. 



9. The Occurrence of Archceopteris Tschermaki, Stur, and of other Species of 



Archaeopteris in Ireland. By T. Johnson, d.sc, f.l.s. (Plates VII., VIII.) 



(June 28, 1911.) Is. 



10. Award of the Boyle Medal to Professor John Joly, m.a., sc.d., f.r.s. (July, 



1911.) Gd. 



11. On the Amount of Radium Emanation in the Soil and its Escape into the 



Atmosphere. By John Joly, sc.d., f.k.s., and Lows B. Smyth, b.a. 

 (Plate IX.) (August, 1911.) Is. 



12. Contributions to our Knowledge of the Floras of the Irish Carboniferous 



Rocks. By E. A. Newell Arber, m.a., f.l.s., f.g.s. (January, 

 1912.) Is. 



13. Forbesia cancellata, gen. et sp. nov. (S^jhenopteris, sp., Baily.) By 



T. Johnson, d.sc, f.l.s. (Plates XIII. and XIV.) (January, 1912.) Is. 



14. The Inheritance of the Dun Coat-Colour in Horses. By James Wilson, m.a., b.so. 



(January, 1912.) Is. 



15. On the Vacuum Tube Spectra of the Vapours of some Metals and Metallic 



Chlorides. Part I. — Cadmium, Zinc, Thallium, Mercury, Tin, Bismuth, 

 Copper, Arsenic, Antimony, and Aluminium. By James H. Pollok, d.sc. 

 (Plates XV. and XVI.) (February 21, 1912.) Is. 



16. Changes in the Osmotic Pressure of the Sap of the Developing Leaves of 



Syringa vulgaris. By Henry H. Dixon, sc.d., f.r.s., and W. R. G. Atkins, 

 M.A. (February 21, 1912.) Gd. 



17. Improvements in Equatorial Telescope Mountings. By Sir Howard Gkubb, 



f.r.s. (Plates XVII.-XIX.) (March 26, 1912.) Is. 



